Yokogawa µR20000 - Manual (Page 9)

1-2
SM 04P02B01-01E
A/D Converter
ASIC
Uses a proprietary one-chip ASIC. The ASIC is a combination analog/digital IC that
contains popular CMOS processes. The table below shows its configuration.
RJC Amp
RTD Amp
Multiplexer
PGA
A/D
Digital
Filter
UART
Controller
Vref
EEPROM
Scanner
Control
BiCMOS Analog CMOS Digital
Temperature
Sensor
Volt, TC
RTD
• Controller
Controls switching of the input signal by the scanner, and switching of the A/D
converter attenuator and RTD/TC mode.
• PGA (programmable gain amplifier)
Programmable amplifier with a gain of 1 to 100 times.
• A/D
Converts analog signals to digital signals. Uses a pulse width modulation-based
integrating A/D converter that suppresses the effects of noise on the input signal. With
dot models, data is converted from the 6 channel per second model and the 12 to 24
channels per 2.5 seconds model.
• UART (Universal Asynchronous Receiver-Transmitter)
Performs serial communications with the CPU via a photocoupler.
EEPROM
Stores data modified by the A/D converter.
Pen Servo (Pen Model)
Balances the pen in the recording position.
• Uses a compact, lightweight motor with a photoencoder.
• The motor is attached to the pen carriage, and moves with the pen.
• The revolution of the motor is controlled by PWM signals from the CPU.
Plotter (Pen Model)
The pen model includes an XY plotter for printing. The plotter consists of an X-axis motor
positioned in the plotter assembly, the Y-axis motor installed in the carriage, and a
solenoid for moving the pen up and down.
Printing Mechanism (Dot Model)
Uses a field-proven six-color wire dot printing system. Also, follows a raster scan
method
* that helps maintain the life-span of the drive train wire. It consists of a driver
board, carriage motor, ribbon shift motor, and other components.
* The printing carriage moves in alternation from left to right and right to left every recording
interval, and prints measured values. When the printing carriage moves from left to right,
measured values are printed in the appropriate order starting on the left. When the printing
carriage moves from right to left, measured values are printed in the appropriate order
starting on the right.
1.1 Principles of Operation